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What is the primary purpose of the onCreate() method in an Android activity?
What is the primary purpose of the onCreate() method in an Android activity?
- To restore the state of the activity from savedInstanceState.
- To initialize UI components and set up the activity's layout. (correct)
- To perform cleanup before the activity is destroyed.
- To handle user input events.
How does an Android activity restore its previous state when being recreated?
How does an Android activity restore its previous state when being recreated?
- By using the savedInstanceState parameter. (correct)
- By querying the system for the last state.
- By calling the onResume() method.
- By accessing a static variable holding the previous state.
Which of the following best describes the purpose of the savedInstanceState bundle?
Which of the following best describes the purpose of the savedInstanceState bundle?
- It contains the activity's resource IDs for view inflation.
- It provides a method to save data on activity pause.
- It stores data to be restored on configuration changes. (correct)
- It holds a reference to the application's context.
In which part of the activity lifecycle is it appropriate to initiate UI-related actions?
In which part of the activity lifecycle is it appropriate to initiate UI-related actions?
What will happen if the mShowCount variable is null when onCreate() is executed?
What will happen if the mShowCount variable is null when onCreate() is executed?
What is the primary purpose of the onCreate() method in an Android Activity?
What is the primary purpose of the onCreate() method in an Android Activity?
What follows the created state in the Activity lifecycle after onCreate() is called?
What follows the created state in the Activity lifecycle after onCreate() is called?
How often is the onCreate() method called during an Activity's lifecycle?
How often is the onCreate() method called during an Activity's lifecycle?
What type of parameter does the onCreate() method accept to restore the Activity's state?
What type of parameter does the onCreate() method accept to restore the Activity's state?
What aspect of an Activity is primarily managed through callbacks such as onCreate()?
What aspect of an Activity is primarily managed through callbacks such as onCreate()?
Which of the following statements about overriding callbacks is true?
Which of the following statements about overriding callbacks is true?
What happens if the onCreate() method is not implemented in an Android Activity?
What happens if the onCreate() method is not implemented in an Android Activity?
How does the onCreate() method relate to an Activity's previously frozen state?
How does the onCreate() method relate to an Activity's previously frozen state?
What is the primary purpose of the onStart() method in the Android activity lifecycle?
What is the primary purpose of the onStart() method in the Android activity lifecycle?
In which scenario will the onStart() method be called multiple times during an activity's lifecycle?
In which scenario will the onStart() method be called multiple times during an activity's lifecycle?
Which of the following statements about the onCreate() method is true?
Which of the following statements about the onCreate() method is true?
What happens if the activity is stopped after onStart() is called?
What happens if the activity is stopped after onStart() is called?
How does the onStart() method relate to the activity becoming ready for user interaction?
How does the onStart() method relate to the activity becoming ready for user interaction?
How does the Android activity lifecycle handle configuration changes?
How does the Android activity lifecycle handle configuration changes?
What is the expected outcome after onCreate() is completed successfully?
What is the expected outcome after onCreate() is completed successfully?
Which of the following describes correctly what the onStart() method helps to manage in terms of activity state?
Which of the following describes correctly what the onStart() method helps to manage in terms of activity state?
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Study Notes
Activity Lifecycle and State
- The
onCreate()method is called when the Activity is first created, for instance, when a user taps a launcher icon. onCreate()is responsible for performing static setup tasks, such as creating views, binding data to lists, among others.onCreate()is only called once during an Activity's lifetime.onCreate()takes aBundleobject as a parameter to restore the Activity's previously frozen state, if one existed.- The
Startedstate is always followed by theonStart()state. - The
onStart()method is called when the Activity is becoming visible to the user. onStart()can be called more than once during the lifecycle.- If the Activity comes to the foreground,
onResume()will be called afteronStart(). - If the Activity becomes hidden,
onStop()will be called afteronStart(). - To restore an Activity's saved state in
onCreate(), use aBundleobject. - Within
onCreate(), check ifsavedInstanceStateis not null. - If
savedInstanceStateis not null, retrieve the saved data usingsavedInstanceState.getString("count"). - Finally, update the UI using
mShowCount.setText(count)to display the restored data.
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